object demo1 {
  def main(args: Array[String]): Unit = {
    val a = 10 // val修饰，不可变
    var b = 10 // var修饰，可变
    b = b + 1
    val string: String = 1.toString
    print(a)
    print(a)
    println(a)
    println(a)
    printf("%s,%s\r\n", "hello", "world")
    val d: Byte = 'a'
    val ch: Char = '中'
    println(d)
    println(ch)



  }

  def test1(): Unit = {
    1
  }

}
